Have any of you ever heard a odd chirping sound when switching
to M5 fuel?

Thanks

Yes when warming up with the lean out valve open.
I was sure I had valve train problems. Pulled top of motor apart looking for it.

never tried it but I am very interested in your results. that is some expensive alky!

I dont think its nitro exactly but something in that chemical family.

Kind of interested in the power gains of this fuel.

We pickked up from 8.05 to 7.89 and used a lot less. This is from the vp website.

M5 contains nitroparaffins, which are relatives of nitromethane in the same chemical family.

This fuel seems to be very friendly in jetting. Steve Petty dynoed a 1000 rear wheel Hp vehicle and increased the jetting 15% and the car made 1080 to the tire. He reduced the jetting to 7% and the car went 1079 to the tire. This is an 8% tuning window. I recommend you jet up 10 to 12% to start and then you can back down from there. Al Brown (Antron's father) did a back to back test with M5 vs. M1. His combination is a 540 ci injected big block Chevy running Top Dragster. With no difference in jetting, the car picked up .11 seconds and 6 mph. Again, every combination is different and you'll need to run the tests to determine what your combination likes.